Functions and features: 1) Offer 2 RJ11 output ports to connect 2 sensors or display systems. 2) Simple and small appearance design, LED indication function to show work condition of every defense area. 3) Built-in rechargeable lithium battery with 7 days standby time in maximum, low battery indication function. 4) Alarm will be triggered when alarm unit is detached. 5) Code modification function. 6) Offer power switch. 7) Built-in short-circuit protection function. Main parameters: 1) Size: 95 x 42 x 25mm. 2) Case: ABS. 3) Output port: 2 ports of RJ11. 4) Alarm volume: â?¥95DB. 5) Standby time of built-in rechargeable lithium battery: 7 days. 6) Code modification function: yes. 7) Low battery indication: yes. 8) External power on / off indication: yes. 9) Power input port: DC Optional accessories: 1) Power adapter: 5V/4A 2) AS3X series IR remote keys For more functions and accessories, kindly please contact our sales or local distributor.